Client side compression algorithm sanity checks: ensure old compression
[openssl.git] / ssl / s3_both.c
1 /* ssl/s3_both.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3  * All rights reserved.
4  *
5  * This package is an SSL implementation written
6  * by Eric Young (eay@cryptsoft.com).
7  * The implementation was written so as to conform with Netscapes SSL.
8  * 
9  * This library is free for commercial and non-commercial use as long as
10  * the following conditions are aheared to.  The following conditions
11  * apply to all code found in this distribution, be it the RC4, RSA,
12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13  * included with this distribution is covered by the same copyright terms
14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15  * 
16  * Copyright remains Eric Young's, and as such any Copyright notices in
17  * the code are not to be removed.
18  * If this package is used in a product, Eric Young should be given attribution
19  * as the author of the parts of the library used.
20  * This can be in the form of a textual message at program startup or
21  * in documentation (online or textual) provided with the package.
22  * 
23  * Redistribution and use in source and binary forms, with or without
24  * modification, are permitted provided that the following conditions
25  * are met:
26  * 1. Redistributions of source code must retain the copyright
27  *    notice, this list of conditions and the following disclaimer.
28  * 2. Redistributions in binary form must reproduce the above copyright
29  *    notice, this list of conditions and the following disclaimer in the
30  *    documentation and/or other materials provided with the distribution.
31  * 3. All advertising materials mentioning features or use of this software
32  *    must display the following acknowledgement:
33  *    "This product includes cryptographic software written by
34  *     Eric Young (eay@cryptsoft.com)"
35  *    The word 'cryptographic' can be left out if the rouines from the library
36  *    being used are not cryptographic related :-).
37  * 4. If you include any Windows specific code (or a derivative thereof) from 
38  *    the apps directory (application code) you must include an acknowledgement:
39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40  * 
41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51  * SUCH DAMAGE.
52  * 
53  * The licence and distribution terms for any publically available version or
54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
55  * copied and put under another distribution licence
56  * [including the GNU Public Licence.]
57  */
58 /* ====================================================================
59  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
60  *
61  * Redistribution and use in source and binary forms, with or without
62  * modification, are permitted provided that the following conditions
63  * are met:
64  *
65  * 1. Redistributions of source code must retain the above copyright
66  *    notice, this list of conditions and the following disclaimer. 
67  *
68  * 2. Redistributions in binary form must reproduce the above copyright
69  *    notice, this list of conditions and the following disclaimer in
70  *    the documentation and/or other materials provided with the
71  *    distribution.
72  *
73  * 3. All advertising materials mentioning features or use of this
74  *    software must display the following acknowledgment:
75  *    "This product includes software developed by the OpenSSL Project
76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
77  *
78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79  *    endorse or promote products derived from this software without
80  *    prior written permission. For written permission, please contact
81  *    openssl-core@openssl.org.
82  *
83  * 5. Products derived from this software may not be called "OpenSSL"
84  *    nor may "OpenSSL" appear in their names without prior written
85  *    permission of the OpenSSL Project.
86  *
87  * 6. Redistributions of any form whatsoever must retain the following
88  *    acknowledgment:
89  *    "This product includes software developed by the OpenSSL Project
90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
91  *
92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103  * OF THE POSSIBILITY OF SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This product includes cryptographic software written by Eric Young
107  * (eay@cryptsoft.com).  This product includes software written by Tim
108  * Hudson (tjh@cryptsoft.com).
109  *
110  */
111 /* ====================================================================
112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
113  * ECC cipher suite support in OpenSSL originally developed by 
114  * SUN MICROSYSTEMS, INC., and contributed to the OpenSSL project.
115  */
116
117 #include <limits.h>
118 #include <string.h>
119 #include <stdio.h>
120 #include "ssl_locl.h"
121 #include <openssl/buffer.h>
122 #include <openssl/rand.h>
123 #include <openssl/objects.h>
124 #include <openssl/evp.h>
125 #include <openssl/x509.h>
126
127 /* send s->init_buf in records of type 'type' (SSL3_RT_HANDSHAKE or SSL3_RT_CHANGE_CIPHER_SPEC) */
128 int ssl3_do_write(SSL *s, int type)
129         {
130         int ret;
131
132         ret=ssl3_write_bytes(s,type,&s->init_buf->data[s->init_off],
133                              s->init_num);
134         if (ret < 0) return(-1);
135         if (type == SSL3_RT_HANDSHAKE)
136                 /* should not be done for 'Hello Request's, but in that case
137                  * we'll ignore the result anyway */
138                 ssl3_finish_mac(s,(unsigned char *)&s->init_buf->data[s->init_off],ret);
139         
140         if (ret == s->init_num)
141                 {
142                 if (s->msg_callback)
143                         s->msg_callback(1, s->version, type, s->init_buf->data, (size_t)(s->init_off + s->init_num), s, s->msg_callback_arg);
144                 return(1);
145                 }
146         s->init_off+=ret;
147         s->init_num-=ret;
148         return(0);
149         }
150
151 int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
152         {
153         unsigned char *p,*d;
154         int i;
155         unsigned long l;
156
157         if (s->state == a)
158                 {
159                 d=(unsigned char *)s->init_buf->data;
160                 p= &(d[4]);
161
162                 i=s->method->ssl3_enc->final_finish_mac(s,
163                         sender,slen,s->s3->tmp.finish_md);
164                 s->s3->tmp.finish_md_len = i;
165                 memcpy(p, s->s3->tmp.finish_md, i);
166                 p+=i;
167                 l=i;
168
169                 /* Copy the finished so we can use it for
170                    renegotiation checks */
171                 if(s->type == SSL_ST_CONNECT)
172                         {
173                          OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
174                          memcpy(s->s3->previous_client_finished, 
175                              s->s3->tmp.finish_md, i);
176                          s->s3->previous_client_finished_len=i;
177                         }
178                 else
179                         {
180                         OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
181                         memcpy(s->s3->previous_server_finished, 
182                             s->s3->tmp.finish_md, i);
183                         s->s3->previous_server_finished_len=i;
184                         }
185
186 #ifdef OPENSSL_SYS_WIN16
187                 /* MSVC 1.5 does not clear the top bytes of the word unless
188                  * I do this.
189                  */
190                 l&=0xffff;
191 #endif
192
193                 *(d++)=SSL3_MT_FINISHED;
194                 l2n3(l,d);
195                 s->init_num=(int)l+4;
196                 s->init_off=0;
197
198                 s->state=b;
199                 }
200
201         /* SSL3_ST_SEND_xxxxxx_HELLO_B */
202         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
203         }
204
205 int ssl3_get_finished(SSL *s, int a, int b)
206         {
207         int al,i,ok;
208         long n;
209         unsigned char *p;
210
211         /* the mac has already been generated when we received the
212          * change cipher spec message and is in s->s3->tmp.peer_finish_md
213          */ 
214
215         n=s->method->ssl_get_message(s,
216                 a,
217                 b,
218                 SSL3_MT_FINISHED,
219                 64, /* should actually be 36+4 :-) */
220                 &ok);
221
222         if (!ok) return((int)n);
223
224         /* If this occurs, we have missed a message */
225         if (!s->s3->change_cipher_spec)
226                 {
227                 al=SSL_AD_UNEXPECTED_MESSAGE;
228                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_GOT_A_FIN_BEFORE_A_CCS);
229                 goto f_err;
230                 }
231         s->s3->change_cipher_spec=0;
232
233         p = (unsigned char *)s->init_msg;
234         i = s->s3->tmp.peer_finish_md_len;
235
236         if (i != n)
237                 {
238                 al=SSL_AD_DECODE_ERROR;
239                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_BAD_DIGEST_LENGTH);
240                 goto f_err;
241                 }
242
243         if (memcmp(p, s->s3->tmp.peer_finish_md, i) != 0)
244                 {
245                 al=SSL_AD_DECRYPT_ERROR;
246                 SSLerr(SSL_F_SSL3_GET_FINISHED,SSL_R_DIGEST_CHECK_FAILED);
247                 goto f_err;
248                 }
249
250         /* Copy the finished so we can use it for
251            renegotiation checks */
252         if(s->type == SSL_ST_ACCEPT)
253                 {
254                 OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
255                 memcpy(s->s3->previous_client_finished, 
256                     s->s3->tmp.peer_finish_md, i);
257                 s->s3->previous_client_finished_len=i;
258                 }
259         else
260                 {
261                 OPENSSL_assert(i <= EVP_MAX_MD_SIZE);
262                 memcpy(s->s3->previous_server_finished, 
263                     s->s3->tmp.peer_finish_md, i);
264                 s->s3->previous_server_finished_len=i;
265                 }
266
267         return(1);
268 f_err:
269         ssl3_send_alert(s,SSL3_AL_FATAL,al);
270         return(0);
271         }
272
273 /* for these 2 messages, we need to
274  * ssl->enc_read_ctx                    re-init
275  * ssl->s3->read_sequence               zero
276  * ssl->s3->read_mac_secret             re-init
277  * ssl->session->read_sym_enc           assign
278  * ssl->session->read_compression       assign
279  * ssl->session->read_hash              assign
280  */
281 int ssl3_send_change_cipher_spec(SSL *s, int a, int b)
282         { 
283         unsigned char *p;
284
285         if (s->state == a)
286                 {
287                 p=(unsigned char *)s->init_buf->data;
288                 *p=SSL3_MT_CCS;
289                 s->init_num=1;
290                 s->init_off=0;
291
292                 s->state=b;
293                 }
294
295         /* SSL3_ST_CW_CHANGE_B */
296         return(ssl3_do_write(s,SSL3_RT_CHANGE_CIPHER_SPEC));
297         }
298
299 static int ssl3_add_cert_to_buf(BUF_MEM *buf, unsigned long *l, X509 *x)
300         {
301         int n;
302         unsigned char *p;
303
304         n=i2d_X509(x,NULL);
305         if (!BUF_MEM_grow_clean(buf,(int)(n+(*l)+3)))
306                 {
307                 SSLerr(SSL_F_SSL3_ADD_CERT_TO_BUF,ERR_R_BUF_LIB);
308                 return(-1);
309                 }
310         p=(unsigned char *)&(buf->data[*l]);
311         l2n3(n,p);
312         i2d_X509(x,&p);
313         *l+=n+3;
314
315         return(0);
316         }
317
318 unsigned long ssl3_output_cert_chain(SSL *s, X509 *x)
319         {
320         unsigned char *p;
321         int i;
322         unsigned long l=7;
323         BUF_MEM *buf;
324         int no_chain;
325
326         if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || s->ctx->extra_certs)
327                 no_chain = 1;
328         else
329                 no_chain = 0;
330
331         /* TLSv1 sends a chain with nothing in it, instead of an alert */
332         buf=s->init_buf;
333         if (!BUF_MEM_grow_clean(buf,10))
334                 {
335                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_BUF_LIB);
336                 return(0);
337                 }
338         if (x != NULL)
339                 {
340                 if (no_chain)
341                         {
342                         if (ssl3_add_cert_to_buf(buf, &l, x))
343                                 return(0);
344                         }
345                 else
346                         {
347                         X509_STORE_CTX xs_ctx;
348
349                         if (!X509_STORE_CTX_init(&xs_ctx,s->ctx->cert_store,x,NULL))
350                                 {
351                                 SSLerr(SSL_F_SSL3_OUTPUT_CERT_CHAIN,ERR_R_X509_LIB);
352                                 return(0);
353                                 }
354                         X509_verify_cert(&xs_ctx);
355                         for (i=0; i < sk_X509_num(xs_ctx.chain); i++)
356                                 {
357                                 x = sk_X509_value(xs_ctx.chain, i);
358
359                                 if (ssl3_add_cert_to_buf(buf, &l, x))
360                                         {
361                                         X509_STORE_CTX_cleanup(&xs_ctx);
362                                         return 0;
363                                         }
364                                 }
365                         X509_STORE_CTX_cleanup(&xs_ctx);
366                         }
367                 }
368         /* Thawte special :-) */
369         for (i=0; i<sk_X509_num(s->ctx->extra_certs); i++)
370                 {
371                 x=sk_X509_value(s->ctx->extra_certs,i);
372                 if (ssl3_add_cert_to_buf(buf, &l, x))
373                         return(0);
374                 }
375
376         l-=7;
377         p=(unsigned char *)&(buf->data[4]);
378         l2n3(l,p);
379         l+=3;
380         p=(unsigned char *)&(buf->data[0]);
381         *(p++)=SSL3_MT_CERTIFICATE;
382         l2n3(l,p);
383         l+=4;
384         return(l);
385         }
386
387 /* Obtain handshake message of message type 'mt' (any if mt == -1),
388  * maximum acceptable body length 'max'.
389  * The first four bytes (msg_type and length) are read in state 'st1',
390  * the body is read in state 'stn'.
391  */
392 long ssl3_get_message(SSL *s, int st1, int stn, int mt, long max, int *ok)
393         {
394         unsigned char *p;
395         unsigned long l;
396         long n;
397         int i,al;
398
399         if (s->s3->tmp.reuse_message)
400                 {
401                 s->s3->tmp.reuse_message=0;
402                 if ((mt >= 0) && (s->s3->tmp.message_type != mt))
403                         {
404                         al=SSL_AD_UNEXPECTED_MESSAGE;
405                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
406                         goto f_err;
407                         }
408                 *ok=1;
409                 s->init_msg = s->init_buf->data + 4;
410                 s->init_num = (int)s->s3->tmp.message_size;
411                 return s->init_num;
412                 }
413
414         p=(unsigned char *)s->init_buf->data;
415
416         if (s->state == st1) /* s->init_num < 4 */
417                 {
418                 int skip_message;
419
420                 do
421                         {
422                         while (s->init_num < 4)
423                                 {
424                                 i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
425                                         &p[s->init_num],4 - s->init_num, 0);
426                                 if (i <= 0)
427                                         {
428                                         s->rwstate=SSL_READING;
429                                         *ok = 0;
430                                         return i;
431                                         }
432                                 s->init_num+=i;
433                                 }
434                         
435                         skip_message = 0;
436                         if (!s->server)
437                                 if (p[0] == SSL3_MT_HELLO_REQUEST)
438                                         /* The server may always send 'Hello Request' messages --
439                                          * we are doing a handshake anyway now, so ignore them
440                                          * if their format is correct. Does not count for
441                                          * 'Finished' MAC. */
442                                         if (p[1] == 0 && p[2] == 0 &&p[3] == 0)
443                                                 {
444                                                 s->init_num = 0;
445                                                 skip_message = 1;
446
447                                                 if (s->msg_callback)
448                                                         s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, p, 4, s, s->msg_callback_arg);
449                                                 }
450                         }
451                 while (skip_message);
452
453                 /* s->init_num == 4 */
454
455                 if ((mt >= 0) && (*p != mt))
456                         {
457                         al=SSL_AD_UNEXPECTED_MESSAGE;
458                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_UNEXPECTED_MESSAGE);
459                         goto f_err;
460                         }
461                 if ((mt < 0) && (*p == SSL3_MT_CLIENT_HELLO) &&
462                                         (st1 == SSL3_ST_SR_CERT_A) &&
463                                         (stn == SSL3_ST_SR_CERT_B))
464                         {
465                         /* At this point we have got an MS SGC second client
466                          * hello (maybe we should always allow the client to
467                          * start a new handshake?). We need to restart the mac.
468                          * Don't increment {num,total}_renegotiations because
469                          * we have not completed the handshake. */
470                         ssl3_init_finished_mac(s);
471                         }
472
473                 s->s3->tmp.message_type= *(p++);
474
475                 n2l3(p,l);
476                 if (l > (unsigned long)max)
477                         {
478                         al=SSL_AD_ILLEGAL_PARAMETER;
479                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
480                         goto f_err;
481                         }
482                 if (l > (INT_MAX-4)) /* BUF_MEM_grow takes an 'int' parameter */
483                         {
484                         al=SSL_AD_ILLEGAL_PARAMETER;
485                         SSLerr(SSL_F_SSL3_GET_MESSAGE,SSL_R_EXCESSIVE_MESSAGE_SIZE);
486                         goto f_err;
487                         }
488                 if (l && !BUF_MEM_grow_clean(s->init_buf,(int)l+4))
489                         {
490                         SSLerr(SSL_F_SSL3_GET_MESSAGE,ERR_R_BUF_LIB);
491                         goto err;
492                         }
493                 s->s3->tmp.message_size=l;
494                 s->state=stn;
495
496                 s->init_msg = s->init_buf->data + 4;
497                 s->init_num = 0;
498                 }
499
500         /* next state (stn) */
501         p = s->init_msg;
502         n = s->s3->tmp.message_size - s->init_num;
503         while (n > 0)
504                 {
505                 i=s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,&p[s->init_num],n,0);
506                 if (i <= 0)
507                         {
508                         s->rwstate=SSL_READING;
509                         *ok = 0;
510                         return i;
511                         }
512                 s->init_num += i;
513                 n -= i;
514                 }
515         ssl3_finish_mac(s, (unsigned char *)s->init_buf->data, s->init_num + 4);
516         if (s->msg_callback)
517                 s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data, (size_t)s->init_num + 4, s, s->msg_callback_arg);
518         *ok=1;
519         return s->init_num;
520 f_err:
521         ssl3_send_alert(s,SSL3_AL_FATAL,al);
522 err:
523         *ok=0;
524         return(-1);
525         }
526
527 int ssl_cert_type(X509 *x, EVP_PKEY *pkey)
528         {
529         EVP_PKEY *pk;
530         int ret= -1,i;
531
532         if (pkey == NULL)
533                 pk=X509_get_pubkey(x);
534         else
535                 pk=pkey;
536         if (pk == NULL) goto err;
537
538         i=pk->type;
539         if (i == EVP_PKEY_RSA)
540                 {
541                 ret=SSL_PKEY_RSA_ENC;
542                 }
543         else if (i == EVP_PKEY_DSA)
544                 {
545                 ret=SSL_PKEY_DSA_SIGN;
546                 }
547 #ifndef OPENSSL_NO_EC
548         else if (i == EVP_PKEY_EC)
549                 {
550                 ret = SSL_PKEY_ECC;
551                 }       
552 #endif
553         else if (i == NID_id_GostR3410_94 || i == NID_id_GostR3410_94_cc) 
554                 {
555                 ret = SSL_PKEY_GOST94;
556                 }
557         else if (i == NID_id_GostR3410_2001 || i == NID_id_GostR3410_2001_cc) 
558                 {
559                 ret = SSL_PKEY_GOST01;
560                 }
561 err:
562         if(!pkey) EVP_PKEY_free(pk);
563         return(ret);
564         }
565
566 int ssl_verify_alarm_type(long type)
567         {
568         int al;
569
570         switch(type)
571                 {
572         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
573         case X509_V_ERR_UNABLE_TO_GET_CRL:
574         case X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
575                 al=SSL_AD_UNKNOWN_CA;
576                 break;
577         case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
578         case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
579         case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
580         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
581         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
582         case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
583         case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
584         case X509_V_ERR_CERT_NOT_YET_VALID:
585         case X509_V_ERR_CRL_NOT_YET_VALID:
586         case X509_V_ERR_CERT_UNTRUSTED:
587         case X509_V_ERR_CERT_REJECTED:
588                 al=SSL_AD_BAD_CERTIFICATE;
589                 break;
590         case X509_V_ERR_CERT_SIGNATURE_FAILURE:
591         case X509_V_ERR_CRL_SIGNATURE_FAILURE:
592                 al=SSL_AD_DECRYPT_ERROR;
593                 break;
594         case X509_V_ERR_CERT_HAS_EXPIRED:
595         case X509_V_ERR_CRL_HAS_EXPIRED:
596                 al=SSL_AD_CERTIFICATE_EXPIRED;
597                 break;
598         case X509_V_ERR_CERT_REVOKED:
599                 al=SSL_AD_CERTIFICATE_REVOKED;
600                 break;
601         case X509_V_ERR_OUT_OF_MEM:
602                 al=SSL_AD_INTERNAL_ERROR;
603                 break;
604         case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
605         case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
606         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
607         case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
608         case X509_V_ERR_CERT_CHAIN_TOO_LONG:
609         case X509_V_ERR_PATH_LENGTH_EXCEEDED:
610         case X509_V_ERR_INVALID_CA:
611                 al=SSL_AD_UNKNOWN_CA;
612                 break;
613         case X509_V_ERR_APPLICATION_VERIFICATION:
614                 al=SSL_AD_HANDSHAKE_FAILURE;
615                 break;
616         case X509_V_ERR_INVALID_PURPOSE:
617                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
618                 break;
619         default:
620                 al=SSL_AD_CERTIFICATE_UNKNOWN;
621                 break;
622                 }
623         return(al);
624         }
625
626 #ifndef OPENSSL_NO_BUF_FREELISTS
627 /* On some platforms, malloc() performance is bad enough that you can't just
628  * free() and malloc() buffers all the time, so we need to use freelists from
629  * unused buffers.  Currently, each freelist holds memory chunks of only a
630  * given size (list->chunklen); other sized chunks are freed and malloced.
631  * This doesn't help much if you're using many different SSL option settings
632  * with a given context.  (The options affecting buffer size are
633  * max_send_fragment, read buffer vs write buffer,
634  * SSL_OP_MICROSOFT_BIG_WRITE_BUFFER, SSL_OP_NO_COMPRESSION, and
635  * SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS.)  Using a separate freelist for every
636  * possible size is not an option, since max_send_fragment can take on many
637  * different values.
638  *
639  * If you are on a platform with a slow malloc(), and you're using SSL
640  * connections with many different settings for these options, and you need to
641  * use the SSL_MOD_RELEASE_BUFFERS feature, you have a few options:
642  *    - Link against a faster malloc implementation.
643  *    - Use a separate SSL_CTX for each option set.
644  *    - Improve this code.
645  */
646 static void *
647 freelist_extract(SSL_CTX *ctx, int for_read, int sz)
648         {
649         SSL3_BUF_FREELIST *list;
650         SSL3_BUF_FREELIST_ENTRY *ent = NULL;
651         void *result = NULL;
652
653         CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
654         list = for_read ? ctx->rbuf_freelist : ctx->wbuf_freelist;
655         if (list != NULL && sz == (int)list->chunklen)
656                 ent = list->head;
657         if (ent != NULL)
658                 {
659                 list->head = ent->next;
660                 result = ent;
661                 if (--list->len == 0)
662                         list->chunklen = 0;
663                 }
664         CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
665         if (!result)
666                 result = OPENSSL_malloc(sz);
667         return result;
668 }
669
670 static void
671 freelist_insert(SSL_CTX *ctx, int for_read, size_t sz, void *mem)
672         {
673         SSL3_BUF_FREELIST *list;
674         SSL3_BUF_FREELIST_ENTRY *ent;
675
676         CRYPTO_w_lock(CRYPTO_LOCK_SSL_CTX);
677         list = for_read ? ctx->rbuf_freelist : ctx->wbuf_freelist;
678         if (list != NULL &&
679             (sz == list->chunklen || list->chunklen == 0) &&
680             list->len < ctx->freelist_max_len &&
681             sz >= sizeof(*ent))
682                 {
683                 list->chunklen = sz;
684                 ent = mem;
685                 ent->next = list->head;
686                 list->head = ent;
687                 ++list->len;
688                 mem = NULL;
689                 }
690
691         CRYPTO_w_unlock(CRYPTO_LOCK_SSL_CTX);
692         if (mem)
693                 OPENSSL_free(mem);
694         }
695 #else
696 #define freelist_extract(c,fr,sz) OPENSSL_malloc(sz)
697 #define freelist_insert(c,fr,sz,m) OPENSSL_free(m)
698 #endif
699
700 int ssl3_setup_read_buffer(SSL *s)
701         {
702         unsigned char *p;
703         size_t len,align=0,headerlen;
704         
705         if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
706                 headerlen = DTLS1_RT_HEADER_LENGTH;
707         else
708                 headerlen = SSL3_RT_HEADER_LENGTH;
709
710 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
711         align = (-SSL3_RT_HEADER_LENGTH)&(SSL3_ALIGN_PAYLOAD-1);
712 #endif
713
714         if (s->s3->rbuf.buf == NULL)
715                 {
716                 len = SSL3_RT_MAX_PLAIN_LENGTH
717                         + SSL3_RT_MAX_ENCRYPTED_OVERHEAD
718                         + headerlen + align;
719                 if (s->options & SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER)
720                         {
721                         s->s3->init_extra = 1;
722                         len += SSL3_RT_MAX_EXTRA;
723                         }
724 #ifndef OPENSSL_NO_COMP
725                 if (!(s->options & SSL_OP_NO_COMPRESSION))
726                         len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
727 #endif
728                 if ((p=freelist_extract(s->ctx, 1, len)) == NULL)
729                         goto err;
730                 s->s3->rbuf.buf = p;
731                 s->s3->rbuf.len = len;
732                 }
733
734         s->packet= &(s->s3->rbuf.buf[0]);
735         return 1;
736
737 err:
738         SSLerr(SSL_F_SSL3_SETUP_READ_BUFFER,ERR_R_MALLOC_FAILURE);
739         return 0;
740         }
741
742 int ssl3_setup_write_buffer(SSL *s)
743         {
744         unsigned char *p;
745         size_t len,align=0,headerlen;
746
747         if (SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
748                 headerlen = DTLS1_RT_HEADER_LENGTH + 1;
749         else
750                 headerlen = SSL3_RT_HEADER_LENGTH;
751
752 #if defined(SSL3_ALIGN_PAYLOAD) && SSL3_ALIGN_PAYLOAD!=0
753         align = (-SSL3_RT_HEADER_LENGTH)&(SSL3_ALIGN_PAYLOAD-1);
754 #endif
755
756         if (s->s3->wbuf.buf == NULL)
757                 {
758                 len = s->max_send_fragment
759                         + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD
760                         + headerlen + align;
761 #ifndef OPENSSL_NO_COMP
762                 if (!(s->options & SSL_OP_NO_COMPRESSION))
763                         len += SSL3_RT_MAX_COMPRESSED_OVERHEAD;
764 #endif
765                 if (!(s->options & SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS))
766                         len += headerlen + align
767                                 + SSL3_RT_SEND_MAX_ENCRYPTED_OVERHEAD;
768
769                 if ((p=freelist_extract(s->ctx, 0, len)) == NULL)
770                         goto err;
771                 s->s3->wbuf.buf = p;
772                 s->s3->wbuf.len = len;
773                 }
774
775         return 1;
776
777 err:
778         SSLerr(SSL_F_SSL3_SETUP_WRITE_BUFFER,ERR_R_MALLOC_FAILURE);
779         return 0;
780         }
781
782
783 int ssl3_setup_buffers(SSL *s)
784         {
785         if (!ssl3_setup_read_buffer(s))
786                 return 0;
787         if (!ssl3_setup_write_buffer(s))
788                 return 0;
789         return 1;
790         }
791
792 int ssl3_release_write_buffer(SSL *s)
793         {
794         if (s->s3->wbuf.buf != NULL)
795                 {
796                 freelist_insert(s->ctx, 0, s->s3->wbuf.len, s->s3->wbuf.buf);
797                 s->s3->wbuf.buf = NULL;
798                 }
799         return 1;
800         }
801
802 int ssl3_release_read_buffer(SSL *s)
803         {
804         if (s->s3->rbuf.buf != NULL)
805                 {
806                 freelist_insert(s->ctx, 1, s->s3->rbuf.len, s->s3->rbuf.buf);
807                 s->s3->rbuf.buf = NULL;
808                 }
809         return 1;
810         }
811